summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
blob: c54806d08dd78d0080ef42a314fe5ac2db40d7b6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
/*
 * Copyright 2015 Freescale Semiconductor, Inc.
 *
 * Freescale DCU drm device driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/backlight.h>
#include <linux/of_graph.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>

#include "fsl_dcu_drm_drv.h"
#include "fsl_tcon.h"

static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs encoder_funcs = {
	.destroy = fsl_dcu_drm_encoder_destroy,
};

int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
			       struct drm_crtc *crtc)
{
	struct drm_encoder *encoder = &fsl_dev->encoder;
	int ret;

	encoder->possible_crtcs = 1;

	/* Use bypass mode for parallel RGB/LVDS encoder */
	if (fsl_dev->tcon)
		fsl_tcon_bypass_enable(fsl_dev->tcon);

	ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
			       DRM_MODE_ENCODER_LVDS, NULL);
	if (ret < 0)
		return ret;

	return 0;
}

static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
{
	struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);

	drm_connector_unregister(connector);
	drm_panel_detach(fsl_con->panel);
	drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	.destroy = fsl_dcu_drm_connector_destroy,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.reset = drm_atomic_helper_connector_reset,
};

static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
{
	struct fsl_dcu_drm_connector *fsl_connector;
	int (*get_modes)(struct drm_panel *panel);
	int num_modes = 0;

	fsl_connector = to_fsl_dcu_connector(connector);
	if (fsl_connector->panel && fsl_connector->panel->funcs &&
	    fsl_connector->panel->funcs->get_modes) {
		get_modes = fsl_connector->panel->funcs->get_modes;
		num_modes = get_modes(fsl_connector->panel);
	}

	return num_modes;
}

static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
					    struct drm_display_mode *mode)
{
	if (mode->hdisplay & 0xf)
		return MODE_ERROR;

	return MODE_OK;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
	.get_modes = fsl_dcu_drm_connector_get_modes,
	.mode_valid = fsl_dcu_drm_connector_mode_valid,
};

static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
				 struct drm_panel *panel)
{
	struct drm_encoder *encoder = &fsl_dev->encoder;
	struct drm_connector *connector = &fsl_dev->connector.base;
	int ret;

	fsl_dev->connector.encoder = encoder;

	ret = drm_connector_init(fsl_dev->drm, connector,
				 &fsl_dcu_drm_connector_funcs,
				 DRM_MODE_CONNECTOR_LVDS);
	if (ret < 0)
		return ret;

	drm_connector_helper_add(connector, &connector_helper_funcs);
	ret = drm_connector_register(connector);
	if (ret < 0)
		goto err_cleanup;

	ret = drm_mode_connector_attach_encoder(connector, encoder);
	if (ret < 0)
		goto err_sysfs;

	ret = drm_panel_attach(panel, connector);
	if (ret) {
		dev_err(fsl_dev->dev, "failed to attach panel\n");
		goto err_sysfs;
	}

	return 0;

err_sysfs:
	drm_connector_unregister(connector);
err_cleanup:
	drm_connector_cleanup(connector);
	return ret;
}

int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
{
	struct device_node *panel_node;
	struct drm_panel *panel;
	struct drm_bridge *bridge;
	int ret;

	/* This is for backward compatibility */
	panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
	if (panel_node) {
		fsl_dev->connector.panel = of_drm_find_panel(panel_node);
		of_node_put(panel_node);
		if (!fsl_dev->connector.panel)
			return -EPROBE_DEFER;
		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
	}

	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
	if (ret)
		return ret;

	if (panel) {
		fsl_dev->connector.panel = panel;
		return fsl_dcu_attach_panel(fsl_dev, panel);
	}

	return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
}